阅读说明：本技术 一种具有旁排功能的冷凝器喉部结构 (Condenser throat structure with side-discharge function ) 是由 张旭阳 周振东 王晓奇 李典来 于 2021-08-26 设计创作，主要内容包括：本发明涉及一种具有旁排功能的冷凝器喉部结构,包括冷凝器喉部壳体,所述凝器喉部壳体一端设有乏汽排放口,上侧设有旁路排放口,所述乏汽排放口与旁路排放口之间安装有一块导流孔板。所述导流孔板与冷凝器喉部壳体的下板平行。本发明的冷凝器喉部结构简单,与传统结构相比,不占用额外的空间。将减压装置与壳体的固定有焊接修改为螺栓联结,减少了冷凝器发生泄漏导致真空破坏的可能性,且采用导流孔板将大部分旁排汽流与乏汽汽流隔开后,乏汽与旁排汽体之间不再相互影响。采用孔板设计使得导流孔板受到的旁排汽流冲击力减小,有利于增加导流孔板结构强度与运行时的稳定性。(The invention relates to a condenser throat structure with a bypass discharge function, which comprises a condenser throat shell, wherein one end of the condenser throat shell is provided with an exhaust steam discharge port, the upper side of the condenser throat shell is provided with a bypass discharge port, and a flow guide pore plate is arranged between the exhaust steam discharge port and the bypass discharge port. The flow guide pore plate is parallel to the lower plate of the shell of the throat part of the condenser. The condenser throat part of the invention has simple structure and does not occupy additional space compared with the traditional structure. The fixing of the pressure reducing device and the shell is changed into bolt connection by welding, so that the possibility of vacuum damage caused by leakage of the condenser is reduced, and after most of side exhaust steam flow and dead steam flow are separated by the flow guide pore plate, the dead steam and side exhaust steam are not influenced mutually. By adopting the design of the pore plate, the impact force of the side exhaust steam flow on the flow guide pore plate is reduced, and the structural strength and the running stability of the flow guide pore plate are favorably improved.)

1. The utility model provides a condenser throat structure with by-pass function, includes condenser throat casing, its characterized in that: one end of the condenser throat shell is provided with an exhaust steam discharge port, the upper side of the condenser throat shell is provided with a bypass discharge port, and a flow guide pore plate is arranged between the exhaust steam discharge port and the bypass discharge port.

2. The condenser throat structure with bypass function according to claim 1, wherein: the flow guide pore plate is parallel to the lower plate of the shell of the throat part of the condenser.

3. The condenser throat structure with bypass function according to claim 1, wherein: and a plurality of supporting plates are arranged between the flow guide pore plate and the upper plate of the shell of the throat part of the condenser.

4. A condenser throat construction with bypass function according to claim 3 wherein: the supporting plate is connected with the flow guide pore plate and the upper plate of the shell of the throat part of the condenser in a welding mode.

5. The condenser throat structure with bypass function according to claim 1, wherein: and the connecting position of the flow guide pore plate and the shell at the throat part of the condenser is fixed in a welding mode.

6. The condenser throat structure with bypass function according to claim 1, wherein: the cold exhaust steam discharge port is connected with the steam turbine exhaust cylinder in a bolt connection mode and used for receiving exhaust steam discharged by the steam turbine along the axial direction.

7. The condenser throat structure with bypass function according to claim 1, wherein: the bypass discharge port is connected with the pressure reducing device in a bolt connection mode and used for receiving bypass discharge steam discharged by the bypass discharge device along the vertical direction on the upper side of the shell at the throat part of the condenser.

Technical Field

The invention relates to a condenser for a marine steam turbine, in particular to a throat structure of the condenser.

Background

The output working condition of the steam turbine in the marine environment changes more frequently, the steam consumption between the working conditions has a larger difference, but the total steam consumption of the system required by the steam turbine changes less when the working condition of the steam turbine changes. Therefore, a bypass system is required to absorb the excess working steam during the low power operation and shutdown of the steam turbine. The by-pass system is therefore an indispensable structure in marine steam turbine systems.

The bypass structure is composed of a plurality of parts. Generally comprises a pressure reducing structure, a temperature reducing structure and a connecting structure of a throat part of a condenser.

At present, the side-row structure of the throat part of the condenser adopts an insertion pipe type structure. The structure is shown in fig. 1.

The insertion pipe type structure directly inserts the side exhaust pipe into the throat part of the condenser, and then the side exhaust pipe and the throat part shell are welded together by a welding method. The side-exhaust steam is discharged into the throat part of the condenser through the pipe inserting structure during the operation of the structure, and then enters the interior of the condenser to exchange heat with cooling water.

The middle position at the condenser throat is installed to the intubate in this structure, and when the steam turbine normally operated, after the exhaust steam must be walked around the side row intubate, just can get into the inside heat transfer with the cooling water of condenser. This will cause a certain pressure loss. And the structure has certain risk when the steam turbine operates and synchronously uses the bypass structure. The accumulation of the steam with high pressure generated by the bypass exhaust mechanism at the throat part is easy to cause the steam pressure at the throat part of the condenser to rise, thereby causing the rise of the back pressure of the steam turbine and finally causing the reduction of the overall output power of the steam turbine.

The tube inserting structure and the shell of the throat part of the condenser are connected in a welding mode, and certain risks exist. The side-discharging pipe is easy to cause the phenomena of pipeline vibration and the like due to the passing of high-speed steam flow in the using process. After long-term use, the welding position between the pipe inserting structure and the throat shell is easy to loosen, a gap is generated, and outside air is flushed into the condenser. Finally, the vacuum inside the condenser is destroyed, and the output power of the steam turbine is reduced.

Disclosure of Invention

In order to improve the flowing state of the bypass structure of the throat part of the condenser, the invention provides the throat part structure of the condenser with the bypass function.

In order to achieve the purpose, the technical scheme of the invention is as follows: a condenser throat structure with a bypass discharge function comprises a condenser throat shell, wherein one end of the condenser throat shell is provided with an exhaust steam discharge port, the upper side of the condenser throat shell is provided with a bypass discharge port, and a flow guide pore plate is arranged between the exhaust steam discharge port and the bypass discharge port.

Further, the flow guide pore plate is parallel to the lower plate of the shell of the throat part of the condenser.

Furthermore, a plurality of support plates are arranged between the flow guide pore plate and the upper plate of the shell of the throat part of the condenser.

Furthermore, the support plate is connected with the flow guide pore plate and the upper plate of the throat shell of the condenser in a welding mode.

Furthermore, the connection position of the flow guide pore plate and the shell of the throat part of the condenser is fixed in a welding mode.

Furthermore, the cold exhaust steam discharge port is connected with the steam turbine exhaust cylinder in a bolt connection mode and used for receiving the exhaust steam discharged by the steam turbine along the axial direction.

Furthermore, the bypass discharge port is connected with the pressure reducing device in a bolt connection mode and used for receiving the bypass discharge steam discharged by the bypass discharge device along the vertical direction on the upper side of the shell of the throat part of the condenser.

The invention has the beneficial effects that:

the condenser throat part of the invention has simple structure and does not occupy additional space compared with the traditional structure. The welding of the decompression device and the shell is modified into bolt connection, so that the possibility of vacuum damage caused by leakage of the condenser is reduced. And after most of the side exhaust steam flow and the dead steam flow are separated by adopting the flow guide pore plate, the dead steam and the side exhaust steam are not influenced mutually. By adopting the design of the pore plate, the impact force of the side exhaust steam flow on the flow guide pore plate is reduced, and the structural strength and the running stability of the flow guide pore plate are favorably improved.

Drawings

FIG. 1 is a view showing a conventional intubation structure;

FIG. 2 is a front view of the condenser throat configuration of the present invention;

FIG. 3 is a left side cross-sectional view of FIG. 2;

FIG. 4 is a schematic illustration of an example of a main valve stem application;

wherein: (a) the method comprises the following steps of (a) operating a steam turbine at full load, (b) performing bypass discharge when the steam turbine is in a shutdown state, and (c) simultaneously performing bypass discharge when the steam turbine is in small-load operation.

Detailed Description

The invention is further described with reference to the following figures and examples.

The invention relates to a novel condenser throat structure. The structure comprises a flow guide pore plate 1, a support plate 2 and a shell 3 at the throat part of the condenser. The assembly positions of the parts are shown in detail in figures 2 and 3.

Wherein, one end of the throat shell 3 of the condenser is provided with a steam exhaust outlet A, and the upper side is provided with a bypass outlet B. The exhaust steam discharge port receives exhaust steam discharged by the steam turbine along the axial direction and is connected with the steam turbine exhaust cylinder in a bolt connection mode. The bypass discharge port vertically receives the bypass steam discharged by the bypass structure at the upper side of the throat part and is connected with the pressure reducing device in a bolt connection mode. A diversion pore plate 1 is arranged between the exhaust steam discharge port and the bypass discharge port. The flow guide pore plate 1 is parallel to the lower plate of the throat shell 3 of the condenser; install polylith backup pad 2 between the upper plate of water conservancy diversion orifice plate 1 and with condenser throat casing 3, and backup pad 2 adopts the welded mode with water conservancy diversion orifice plate 1 and condenser throat casing 3's upper plate to be connected, and the hookup location of water conservancy diversion orifice plate 1 and condenser throat casing 3 also adopts the welded mode to fix.

When the condenser throat shell is installed, the welding between the upper plate of the condenser throat shell 3 and the support plate 2 is firstly completed, and then the welding between the support plate 2 and the flow guide pore plate 1 is performed. Weld stress relief and post weld machining of the welded assembly are then performed. Thereafter the upper plate of the condenser throat shell 3 is welded to the remaining plates of the condenser. The installation steps between the throat part of the condenser and the condenser are the same as those of a common condenser

The operation of the condenser throat at various operating conditions is illustrated in fig. 4.

Fig. 4 (a) shows the throat flow when the bypass line is closed during full-load operation of the steam turbine. After the exhaust steam enters the condenser, part of steam enters the upper side of the flow guide pore plate through the holes in the flow guide pore plate, so that the whole throat cavity of the condenser is filled with the steam, and a condensation tube bundle area on the rear side of the throat cavity can uniformly contact the exhaust steam.

Fig. 4 (b) shows the throat flow during the bypass operation in the turbine stop state. After the side-exhaust steam enters the throat part, part of the side-exhaust steam flows into the lower side of the throat part through holes on the flow guide pore plate, and most of the side-exhaust steam flows into the condensation tube bundle area along the flow guide pore plate.

Fig. 4 (c) shows the throat flow of the steam turbine in the low power state while performing the low flow bypass. And part of the side-discharged steam enters the lower part of the throat part through holes on the flow guide pore plate. Because the steam quantity is less, the emission of the dead steam cannot be influenced. The back pressure and the output power of the steam turbine can thus be ensured.